Arrangement in explosion joining of high tension lines and the like

ABSTRACT

The present invention relates to detonation joining of high tension lines and the like in which the line ends and their steel cores respectively are joined together by a single shot or detonation. According to the invention each of the line ends to be joined is provided with an exposed core end on which is firmly wedged a separate steel sleeve having an outer diameter approximately equal to that of the line, a main connecting tube of aluminium enclosing the adjacent steel sleeves and parts of the line ends is provided with an exterior layer of explosive charge which during detonation compresses said main connecting tube around the line ends and simultaneously around the steel sleeves which thereby are compressed around the core ends so that an effective mutual anchorage of the components of the joint is obtained.

United States Patent Osteng [4 1 June 13, 1972 [54] ARRANGEMENT IN EXPLOSION 2,367,206 1/1945 Davis..... ..339/276 EU JOINING OF H TENSION LINES 3,184,535 5/1965 Worthington ..174 90 3,384,704 5/1968 Vockroth ....l74/90 AND THE LIKE 3,542,276 11/1970 James .l ..l74/94 RU [72] Inventor: Tor Osteng, 2831 Raufoss, Norway Primary Examiner-Darrell L. Clay [22] 1970 AttarneyWaters, Roditi, Schwartz & Nissen [21] Appl. No.: 94,344

[ ABSTRACT 30 F A ti D m The present invention relates to detonation joining of high 1 orelgn pp on [on y a tension lines and the like in which the line ends and their steel Dec. 6, 1969 Norway ..4828/69 cores respectively are joined together by a single shot or detonation. According to the invention each of the line ends [52] U.S. Cl. ..174/90, 29/628, 174/94 R, to be joined is provided with an exposed core end on which is 174/79, 339/276 E firmly wedged a separate steel sleeve having an outer diameter 51 Int. Cl. ..H02g 15/08 approximately equal 10 that of the line, a main connecting [58] Field of Search ..l74/84R, 84C, 848, 88 R, tube of aluminium enclosing the adjacent Steel Sleeves and 174/8 s 90 94 R, 94 s 79; 339 275 E, 27 E 276 parts Of the line ends is provided with an exterior layer of ex- 24/|26 R, 136 R; 237/109; 29/628 plosive charge which during detonation compresses said main connecting tube around the line ends and simultaneously [56] References Cited around the steel sleeves which thereby are compressed around the core ends so that an effective mutual anchorage of the N E STATES T N S components of the joint is obtained.

2,251,189 7/1941 Jensen ..174/90 U 3 Claims, 4 Drawing Figures PATENTEDJUM 1 3 1972 3.670. 090

' 0 A c A E m m fjfjiijiij :1

The present invention relates to detonation joining of high tension lines and the like in which the line ends and their steel cores are joined together by a single shot or detonation.

Previously it has been proposed in detonation joining of high tension lines to connect exposed ends of the steel cores by a steel tube and to enclose said tube and the line ends by a main connecting tube of aluminum provided with an external layer of explosive by detonation of which said main connecting tube is compressed around the line ends and at the same time effects compression of said steel tube around the core ends.

The present invention relates to an arrangement of the above named kind by means of which a separate securing of each of the core ends to the main connecting tube is effected whereby a more effective attachment of the core ends is obtained at the same time as the arrangement with same advantage may be used in connection with unstressing joints and the like.

The invention is mainly distinguished thereby that each of the exposed core ends is wedged firmly in a separate steel sleeve adapted to the interior diameter of the main connecting tube and preferably provided on its outer surface with grooves securing an efiective anchorage in the main connecting tube when this is compressed around the line ends and the steel sleeves. v

, Embodiments of the invention are illustrated in the accompanying drawing in which: 7

FIG. 1 is a longitudinal sectional view of a steel sleeve wedged on the end of a core end;

FIG. 2 is a cross-section thereof;

FIG. 3 is a side view partly in section of a part of a line joint; and

FIG. 4 is a side view with parts cut away of an unstressing joint.

A preferred embodiment of a wedging device for application on an exposed core end of a line to be joined is illustrated in FIG 1 and 2.

The wedging device comprises a circular steel sleeve l one end of which has a bore 2 with a diameter corresponding to the outer diameter of the core 3. Said bore 2 passes by a conical portion 4 into an enlarged cylindrical part 5 which at the other end of the sleeve has a conically enlarged end portion 6. A cylindrical wedge 7 is adapted to be inserted into the bore of the sleeve with a selected clearance. Said wedge has a pointed inner end 8 and at the opposite outer end a conically enlarged part 9 having equal conicity as that of the portion 6 of the bore 5 The wedge 7 is provided on the outer surface thereof with a number of longitudinally extending and circumferentially evenly distributed grooves 10 with semi-circle shaped crosssection and with a centrally through bore 1 I. Said longitudinal grooves 10 of the wedge 7 are adapted to receive and guide the twisted wire ends 3a of the core in engagement with the bore of the sleeve while said central bore 11 serves to receive the central wire of the core. The number of grooves 10 thus correspond to the number of twisted wires in the core 3.

In mounting of the wedging device the core 3 is thread into the sleeve through the corresponding bore 2 and then the wedge 7 is driven into the bore 5 from the opposite end of the sleeve so that the central wire is guided through the bore 11 and the twisted wires in each of the grooves 10 until the last named wires are clamped between the wedge and sleeve.

in order to secure a good anchorage of the steel sleeve this may be provided on its outer surface with circumferential grooves 12 preferably of stepped form.

In FIG. 3 is illustrated the performance of joining ends of lines by use of the above described wedging devices. In the figure A denotes the ends of the lines to be joined the exposed core ends of which (not shown) each is provided with a wedging device I, 7 mounted thereon as described in connection with H6. 1 and 2.

The line ends with the wedging devices are inserted into a main connecting tube C of aluminum, each from opposite ends thereof until the sleeves 1 come in contact, which main connecting tube with effectuation of an elastic intermediate layer D has an exterior layer of explosive, such as one or more wound layers of detonating fuse E.

During detonation of the explosive E the main connecting tube C is compressed around the ends of the line A and the steel sleeves l of the wedge devices in a manner known per se.

In order to secure an effective compression of the steel sleeves the explosive layer may be amplified by one or more additional wound layers Ea of detonating fuse which extend in the axial length of the main connecting tube which is occupied by the sleeves 1.

In FIG. 4 is shown an unstressing joint with use of the above described wedge devices 1, 7 for securing of the line core.

The main connecting tube C is on an intermediate elastic layer D provided with an outer layer of explosive consisting of one or more wound layers of detonating fuse E.

In the outer end of the main connecting tube C a stem 15 of an unstressing hook is inserted as shown said stem being provided with circumferential grooves 15a in order to secure an effective anchorage in the tube C. The line end A with the steel sleeve 1, in which the exposed end of the steel core is wedged in the manner above described, is inserted into the tube C from the other end thereof into contact with the inner end of the hook stem 15. During detonation of the explosive the main connecting tube is compressed around the stem 15, the steel sleeve 1 and the line end A in the above described manner so that a wholly effective mutual anchorage of the components of the joint is obtained.

In order to also in this case ensure an effective compression of the steel sleeve 1, the layer E of explosive may be strengthened with one or more additional layer Ea of detonating fuse in the length of the sleeve 1.

I claim:

1. A joint for high tensionlines or the like, each having a core formed of a plurality of twisted wire strands surrounded by additional strands, said line ends having exposed core ends, a steel sleeve encompassing each said core end, the bore of the steel sleeve having a diameter at a first end corresponding to the outer diameter of the core, the other end of the sleeve having an enlarged cylindrical bore joined to said bore at the first end through an intermediate conical portion; a steel wedge positioned in at least said enlarged bore so as to wedge said core end in said sleeve, the individual wire ends of the core being distributed about the circumferential surface of the sleeve bore and wedged thereagainst by said wedge, the outer surface of each of said sleeves including peripheral grooves; an aluminum connecting tube encompassing said steel sleeves and having a bore dimensioned to correspond with the outer diameters of said sleeves; said aluminum tube being compressively deformed onto said steel sleeves to provide an effective anchorage for said core, line ends and said additional strands.

2. A joint according to claim 1, characterized in that the wedge has longitudinally extending and circumferentially distributed guide grooves receiving the core strands and having a depth which is less than the diameter of the core strands.

3. A joint according to claim 1, characterized in that the wedge has a central bore receiving the central strand of the core. 

1. A joint for high tension lines or the like, each having a core formed of a plurality of twisted wire strands surrounded by additional strands, said line ends having exposed core ends, a steel sleeve encompassing each said core end, the bore of the steel sleeve having a diameter at a first end corresponding to the outer diameter of the core, the other end of the sleeve having an enlarged cylindrical bore joined to said bore at the first end through an intermediate conical portion; a steel wedge positioned in at least said enlarged bore so as to wedge said core end in said sleeve, the individual wire ends of the core being disTributed about the circumferential surface of the sleeve bore and wedged thereagainst by said wedge, the outer surface of each of said sleeves including peripheral grooves; an aluminum connecting tube encompassing said steel sleeves and having a bore dimensioned to correspond with the outer diameters of said sleeves; said aluminum tube being compressively deformed onto said steel sleeves to provide an effective anchorage for said core, line ends and said additional strands.
 2. A joint according to claim 1, characterized in that the wedge has longitudinally extending and circumferentially distributed guide grooves receiving the core strands and having a depth which is less than the diameter of the core strands.
 3. A joint according to claim 1, characterized in that the wedge has a central bore receiving the central strand of the core. 